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Deformation of Polycrystalline MgO at High Hydrostatic Pressure
Author(s) -
AUTEN T. A.,
RADCLIFFE S. V.
Publication year - 1976
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1976.tb10946.x
Subject(s) - deformation (meteorology) , hydrostatic pressure , materials science , crystallite , dislocation , composite material , hydrostatic equilibrium , brittleness , compression (physics) , stress (linguistics) , optical microscope , transmission electron microscopy , strain (injury) , scanning electron microscope , mineralogy , metallurgy , geology , thermodynamics , medicine , linguistics , philosophy , physics , quantum mechanics , nanotechnology
Vacuum‐hot‐pressed MgO polycrystals were deformed in compression at hydrostatic pressures up to 1000 MPa in an effort to obtain gross plastic deformation at room temperature. Although transmission electron microscopy observations indicated an increase in dislocation density at pressures > 400 MPa, direct optical observations during deformation indicated that microfracturing persists as a mode of deformation throughout the stress‐strain curves at even the highest test pressures. As in previous investigations, pressures > 400 MPa led to a transition from completely brittle to ductile behavior, as indicated by stress‐strain plots, but direct optical observations suggested that the apparent transition is an effect of pressure on the mode of crack propagation.